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    <meta charset="UTF-8">
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    <title>Document</title>
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<body>
    <script>
        Function.__proto__ === Function.prototype;
        var foo = new Function("x","y","return x>y?:x,y");
        foo.prototype;
        foo.constructor.name;
        
        function Foo(){}
        var f1 = new Foo();
        var f2 = new Foo();
        f1.__proto__ === f2.__proto__;
        Foo.prototype.x = 1;
        f1.x; //1
        f2.x; //1
        f1.__proto__.x = 2;
        f2.x; //2
        f1.x=3;
        f2.x; //2
        console.log(dir(f2))

        


       
    </script>
</body>
